:root {
  --blue: #147dff;
  --blue-dark: #0d55b8;
  --ink: #17243b;
  --muted: #65748a;
  --line: #dce8f5;
  --surface: #f4f9ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: #fff;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 2%, rgba(86, 183, 255, 0.2), transparent 24rem),
    linear-gradient(180deg, #f4f9ff 0, #fff 34rem);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.site-header {
  width: min(1120px, calc(100% - 48px));
  min-height: 82px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  border-radius: 11px;
  box-shadow: 0 8px 22px rgba(20, 125, 255, 0.16);
}

.brand span {
  display: grid;
  gap: 2px;
}

.brand strong {
  font-size: 17px;
}

.brand small {
  color: var(--muted);
  font-size: 11px;
}

.header-link {
  padding: 9px 16px;
  border: 1px solid #bbd9f8;
  border-radius: 999px;
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  font-weight: 700;
}

main {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  max-width: 820px;
  padding: 88px 0 92px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.24em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  color: #125ebf;
  font-size: clamp(45px, 7vw, 76px);
  line-height: 1.12;
  letter-spacing: -0.055em;
}

.hero-copy {
  max-width: 720px;
  margin-bottom: 32px;
  color: #506985;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.primary-button,
.secondary-button {
  min-height: 54px;
  padding: 0 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 800;
}

.primary-button {
  color: #fff;
  background: linear-gradient(135deg, #1e93ff, #126ae5);
  box-shadow: 0 13px 28px rgba(18, 106, 229, 0.22);
}

.secondary-button {
  color: var(--blue-dark);
  border: 1px solid #c8dff5;
  background: rgba(255, 255, 255, 0.76);
}

.helper {
  margin: 16px 0 0;
  color: #8190a3;
  font-size: 12px;
}

.section {
  padding: 76px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 30px;
}

.section-heading p {
  margin-bottom: 8px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: clamp(27px, 4vw, 40px);
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.plan-card {
  min-height: 290px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 15px 40px rgba(43, 92, 143, 0.08);
}

.plan-card.featured {
  border-color: #84bfff;
  background: linear-gradient(150deg, #f7fbff, #eaf5ff);
  box-shadow: 0 18px 46px rgba(20, 125, 255, 0.14);
}

.plan-card > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.plan-name {
  font-size: 17px;
  font-weight: 900;
}

.tag {
  padding: 5px 9px;
  border-radius: 999px;
  color: var(--blue-dark);
  background: #e5f2ff;
  font-size: 11px;
  font-weight: 800;
}

.plan-card > p {
  margin: 32px 0 30px;
  color: var(--blue);
}

.plan-card strong {
  font-size: 45px;
  line-height: 1;
}

.plan-card strong small {
  margin-right: 3px;
  font-size: 18px;
}

.plan-card > p span {
  margin-left: 7px;
  color: var(--muted);
  font-size: 13px;
}

.plan-card ul {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  color: #53677f;
  font-size: 14px;
  list-style: none;
}

.plan-card li::before {
  content: "✓";
  margin-right: 8px;
  color: var(--blue);
  font-weight: 900;
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.info-card {
  min-height: 150px;
  padding: 24px;
  display: flex;
  gap: 16px;
  border-radius: 17px;
  background: var(--surface);
}

.icon {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: #fff;
  background: var(--blue);
  font-size: 14px;
  font-weight: 900;
}

.info-card h2 {
  margin-bottom: 9px;
  font-size: 18px;
}

.info-card p {
  margin-bottom: 0;
  color: #5c7088;
  font-size: 14px;
  line-height: 1.8;
}

.notice {
  margin: 76px 0;
  padding: 28px 30px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.notice h2 {
  margin-bottom: 18px;
  font-size: 21px;
}

.notice ol {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 10px;
  color: #617188;
  font-size: 13px;
  line-height: 1.75;
}

footer {
  padding: 38px 24px 42px;
  color: #718198;
  background: #f3f7fb;
  text-align: center;
  font-size: 12px;
}

footer strong {
  color: #42566f;
}

footer nav {
  margin: 18px 0;
  display: flex;
  justify-content: center;
  gap: 24px;
}

footer nav a {
  color: var(--blue-dark);
}

.copyright {
  margin-bottom: 0;
  color: #98a5b5;
}

@media (max-width: 760px) {
  .site-header,
  main {
    width: calc(100% - 32px);
  }

  .site-header {
    min-height: 72px;
  }

  .hero {
    padding: 58px 0 70px;
  }

  h1 {
    font-size: clamp(40px, 13vw, 58px);
  }

  .hero-copy {
    font-size: 16px;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }

  .section {
    padding: 58px 0;
  }

  .plan-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .plan-card {
    min-height: 0;
  }

  .notice {
    margin: 58px 0;
    padding: 23px 20px;
  }

  footer nav {
    gap: 15px;
  }
}